@book{70474,
	author = {Vallejo, César,},
	title = {El tungsteno /},
	publisher = {Montesinos,},
	year = {[2012]},
	address = {[Mataró (Barcelona)] :},
	url = {https://login.zproxy.cun.edu.co/login?url=https://www.digitaliapublishing.com/a/24412/}
}